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We were being careless in some places about the order of -L switches in link command lines, such that -L switches referring to external directories could come before those referring to directories within the build tree. This made it possible to accidentally link a system-supplied library, for example /usr/lib/libpq.so, in place of the one built in the build tree. Hilarity ensued, the more so the older the system-supplied library is. To fix, break LDFLAGS into two parts, a sub-variable LDFLAGS_INTERNAL and the main LDFLAGS variable, both of which are "recursively expanded" so that they can be incrementally adjusted by different makefiles. Establish a policy that -L switches for directories in the build tree must always be added to LDFLAGS_INTERNAL, while -L switches for external directories must always be added to LDFLAGS. This is sufficient to ensure a safe search order. For simplicity, we typically also put -l switches for the respective libraries into those same variables. (Traditional make usage would have us put -l switches into LIBS, but cleaning that up is a project for another day, as there's no clear need for it.) This turns out to also require separating SHLIB_LINK into two variables, SHLIB_LINK and SHLIB_LINK_INTERNAL, with a similar rule about which switches go into which variable. And likewise for PG_LIBS. Although this change might appear to affect external users of pgxs.mk, I think it doesn't; they shouldn't have any need to touch the _INTERNAL variables. In passing, tweak src/common/Makefile so that the value of CPPFLAGS recorded in pg_config lacks "-DFRONTEND" and the recorded value of LDFLAGS lacks "-L../../../src/common". Both of those things are mistakes, apparently introduced during prior code rearrangements, as old versions of pg_config don't print them. In general we don't want anything that's specific to the src/common subdirectory to appear in those outputs. This is certainly a bug fix, but in view of the lack of field complaints, I'm unsure whether it's worth the risk of back-patching. In any case it seems wise to see what the buildfarm makes of it first. Discussion: https://postgr.es/m/25214.1522604295@sss.pgh.pa.us
23 lines
482 B
Makefile
23 lines
482 B
Makefile
subdir = src/interfaces/libpq/test
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top_builddir = ../../../..
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include $(top_builddir)/src/Makefile.global
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ifeq ($(PORTNAME), win32)
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LDFLAGS += -lws2_32
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endif
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override CPPFLAGS := -I$(libpq_srcdir) $(CPPFLAGS)
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LDFLAGS_INTERNAL += $(libpq_pgport)
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PROGS = uri-regress
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all: $(PROGS)
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installcheck: all
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SRCDIR='$(top_srcdir)' SUBDIR='$(subdir)' \
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$(PERL) $(top_srcdir)/$(subdir)/regress.pl
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clean distclean maintainer-clean:
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rm -f $(PROGS) *.o
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rm -f regress.out regress.diff
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